Design of API 16C Choke manifold audit debate.

[jaydeep29]

I have couple of issue with my previous API16C certificate getting regarding.
In my choke manifold design 3 1/8"-5K sizes 2-positive chokes and 3-gate valves and 2-spools and studded tees.
I did hydro static teste choke manifold on 7500psi.
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All things acceptable by auditor only testing pressure. So here he gave N.C.
So,my question is in API 6A 20th ed. shows testing presser is 7500psi for 5000psi equipment. And in API 16C shows 10000psi for 5000psi for choke manifold.
So, how can we apply 7500psi tested valves in 10000psi choke manifold.

Please anyone one who have great experience in API16C products who can help finish to solve my query.

 

[LittleInch]

Test the manifold without the valves installed? Not an unusual occurrence because the strength test is there for the materials, not the flanged joint. A bit of a pain, but you can either bolt the sections together or use spool pieces of the same size

This arises because API 6A used to have the same requirement at 5,000, i.e. test to 10,000, but reduced this to 7,500 psi some time ago. You may be able to get approval from the valve suppliers to test to 10,000 psi on the basis that the design probably still allows for it.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[jaydeep29]

First thank you sir.
Second i had tested whole choke manifold assembly 3 1/8" x 5000 psi according API 16C procedure ,but test pressure was 7500 psi and due to old API 16C first edition (1998).
So i get N.C only reason is API mention 10000 psi testing for 5000 psi choke manifold.
And form your answer i found that this problem has been solved in latest API 16C edition.

 

[LittleInch]

Would you care to tell us how it has been solved? It is always good practice when using any code to check what is the latest edition.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[jaydeep29]

Okay! only the reason is i had use old API 16C edition and now i had checked in 2009 edition found that test pressure has been revised form 10000 psi to 7500 psi for choke manifold assembly hydro-static testing.
So now i have to only resubmit my design as per latest edition.
What else any other requirements?

 

[LittleInch]

No, a little surprised, or perhaps deep down I'm not really very surprised that your auditor didn't know the rules of the design he was auditing....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[jaydeep29]

A little help required!!!

I have found out API 16C -2009 draft copy and all hydro static testing parameter is change.So this copy data is valid to use? Which latest addenda available in market? Is it still there 1998 First edition?



My Motto: Keep calm and never give up.

 

[jaydeep29]

Still in oil & gas market API 16C 1993 First edition?
Check draft version of API 16C -2009.
Anybody who have good experience in API products enlighten me.



My Motto: Keep calm and never give up.

 

[LittleInch]

It appears as if the current version is the first one dated 1993. API reaffirm their specifications approximately every 5 years, hence your "1998" version. The latest one on sale via API has "R2010" written after it which I assume means re-affirmed in 2010.

The latest draft version (edition 2, rev 3) seems to be out for voting. The latest found updated in may 2014 was the attached which states intention to re-issue in "2014". However standards organisations are notoriously slow and deliberate, so that could stretch to Q1 2015.

http://www.pngis.net/standards/details.asp?StandardID=API+Spec+16C

So maybe your inspector was correct after all.... see my first reply as to your possible options.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[jaydeep29]

Agree to disagree sir.Because "AT engineering solutions ltd" UK company data shows that they did test on as per latest second draft 2009 edition.
Please find the attachment.

My Motto: Keep calm and never give up.

 

[LittleInch]

No attachment

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[jaydeep29]

Check please.

My Motto: Keep calm and never give up.

 

[LittleInch]

I can only tell you what the official status of the standards are. If you state you are going to use the draft version in your design basis or agree this in writing with your client, then everyone will be happy. Otherwise, as far as I can tell, the current version is edition 1 (i.e. the 1993 version), with draft versions seemingly floating around.

AT have simply stated what they intend to do, so you can accept this as a purchaser or not. Doesn't mean that the draft version is the official latest version....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[jaydeep29]

Of-course.This statement clears my last thoughts.If customer happy than all happy.


My Motto: Keep calm and never give up.